Position-sensorless control method, device and system for permanent magnet synchronous motor with LC filter
A technology of permanent magnet synchronous motor and LC filter, which is applied in the direction of control system, motor control, vector control system, etc., can solve the problems of high observer order, many debugging parameters, and complicated debugging process, so as to reduce the difficulty, The effect of reducing order
Active Publication Date: 2022-06-07
CHINA UNIV OF MINING & TECH
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In the prior art, there is a position sensorless control of permanent magnet synchronous motor with LC filter by constructing a state observer in the static coordinate system, but this method has a higher order of the observer, more debugging parameters, and The debugging process is complicated
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[0065] The technical solutions of the present invention are further described below with reference to the accompanying drawings and specific embodiments.
[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field of this application, and the terms used herein in the specification of the application are only used to describe specific embodiments. It is not intended that this application be limited.
[0067] like figure 1 As shown, an embodiment of the present invention provides a sensorless control method for a permanent magnet synchronous motor with an LC filter, the method comprising:
[0068] S1: Obtain the α-axis and β-axis components of the inverter side voltage in the k-1 and k-2 sampling periods;
[0069] S2: According to the α-axis and β-axis components of the inverter side voltage in the k-1 and k-2 sampling periods, the observed values of the α-axis ...
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The invention discloses a position sensorless control method, device and system for a permanent magnet synchronous motor with an LC filter, and the method comprises the steps: obtaining the observation values of the alpha-axis component and the beta-axis component of the stator voltage of the permanent magnet synchronous motor in the kth sampling period according to the alpha-axis component and the beta-axis component of the inverter side voltage in the (k-1) th sampling period and the (k-2) th sampling period; obtaining the stator current of the permanent magnet synchronous motor according to the inverter side current and the LC filter capacitor fundamental wave current; observation values of alpha-axis and beta-axis components of stator voltage of the permanent magnet synchronous motor and stator current of the permanent magnet synchronous motor in the kth sampling period are calculated, and an estimated value of extended counter electromotive force of the permanent magnet synchronous motor is observed; and according to the estimated value of the extended counter electromotive force of the permanent magnet synchronous motor, obtaining the estimated electrical angular velocity and electrical angle of the permanent magnet synchronous motor. According to the invention, the long-line effect influence caused by high frequency of power electronics is effectively solved through the LC filter, position-sensorless control can be realized, the cost of the control system is effectively reduced, and the reliability of the system is improved.
Description
technical field [0001] The invention relates to a position sensorless control method, device and system of a permanent magnet synchronous motor with an LC filter, belonging to the technical field of power electronics. Background technique [0002] Permanent magnet synchronous motors have the advantages of high operating efficiency, high power density, and simple control, so they are widely used in transmission fields of various voltage and power levels, such as mining equipment drive fields, rail transit fields, ship drive fields, and various servo drives. system. [0003] In most occasions, the permanent magnet synchronous motor is usually driven directly by an inverter without a filter, but in extreme working environments such as mines and oil wells, the inverter and the permanent magnet synchronous motor are usually installed at two distances away from each other. For remote locations, it is necessary to use longer cables to transmit the pulsed voltage output by the inve...
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Login to View More IPC IPC(8): H02P21/18H02P21/22H02P21/13H02P25/024H02P27/08
CPCH02P21/18H02P21/22H02P21/13H02P25/024H02P27/085H02P2207/05
Inventor 吴翔李超刘志恒李佳王储谭国俊
Owner CHINA UNIV OF MINING & TECH